In Mastodon profiles one can add links which can be verified. Their front-end says:

You can verify yourself as the owner of the links in your profile metadata. For that, the linked website must contain a link back to your Mastodon profile. The link back must have a rel="me" attribute. The text content of the link does not matter. Here is an example:

<a rel="me" href="https://mastodon.world/@foximax">Mastodon</a>

It would be great if there was a way to add similar to one's BMaC page to make this work.